286 



SPLANCHNOLOGY. 



inferior maxilla and the anterior border of the wing of the atlas ; 

 it lies immediately below the ear, which it partly surrounds, and 

 is covered by the deprimens aurem. It is related internally with 

 the guttural pouch, and inferiorly it occupies the angular space 

 formed by the jugular and glosso-facial veins. It is greyish, and, 

 like all salivary glands, conglomerate, consisting of a number of 

 lobes held together by dense areolar tissue, these again consisting 

 of lobules, each of which is formed by minute vesicles, originat- 

 ing in the dilatation of the branched origins of the ducts. The 

 latter unite to form larger ones, and terminate in Steno's duct, 

 which commences at the antero-inferior surface, near the insertion 



FIG. 92. 



Eight infero-lateral view of the head ; the maxillary ramus, cheek, parotid gland, and upper lip 

 being removed, a, Submaxillary gland ; b, Whartoii's duct ; c, Subiingual gland ; d, Its excretory 

 orifices ; e c, Labial glands ; /, Their excretory orifices ; <j, Papilla, with orifice of Steno's duct ; 

 h, Orifices of the superior, and, i, those of the inferior molar glands ; k, The hard palate ; I, The soft 

 palate ; m, The tongue, with its papillae ; n, Pillars of the tongue and soft palate ; o, Fraenum- 



of the sterno-maxillaris, passes along the posterior aspect of the 

 digastricus, round the ramus of the lower jaw, in company with, 

 and posterior to, the glosso-facial artery and vein ; it thus runs 

 along the anterior border of the masseter, and enters the mouth 

 at about the level of the third upper molar tooth, the orifice of 

 the duct being marked by a papilla on the buccal membrane. 

 In some animals there is a small detached gland connected with 

 it, the glandula soda parotidis, which opens into the parotid 

 duct as it crosses the masseter. The duct consists of an internal 

 mucous and an external contractile coat. 



